18-Channel Gamma Buffer with Regulator ADD8709 FEATURES FUNCTIONAL BLOCK DIAGRAM GND VDD 700* FB VOLTAGE REGULATOR GAMMA BUFFERS VREG OUT 700* VIN18 APPLICATIONS LCD TV panels LCD monitor panels VIN16 GENERAL DESCRIPTION VIN14 An on-board voltage regulator provides a fixed input for the gamma buffers, isolating the gamma curve from supply ripple. The ADD8709 is specified over the temperature range of -40C to +105C and comes in a 48-lead, Pb-free, low-profile quad flat package. VOUT18 700* VIN17 The ADD8709 is an 18-channel integrated gamma reference for use in LCD TV and monitors panels. The output buffers feature high current drive and low offset voltage to provide an accurate and stable gamma curve. The top nine channels swing to VDD and the lower nine channels swing to GND. VDD VDD VOUT17 700* VOUT16 700* VIN15 VOUT15 700* VOUT14 700* VIN13 VOUT13 700* VIN12 VOUT12 700* VIN11 VOUT11 700* VIN10 VOUT10 700* VIN9 VOUT9 700* VIN8 VOUT8 700* VIN7 VOUT7 700* VIN6 VOUT6 700* VIN5 VOUT5 700* VIN4 VOUT4 700* VIN3 VOUT3 700* VIN2 VOUT2 700* VIN1 *ESD PROTECTION RESISTORS VOUT1 GND GND 04715-001 18 precision gamma reference outputs Mask-programmable voltage regulator: 0.4% accuracy Upper 9 buffers swing to VDD Lower 9 buffers swing to GND Single-supply operation: 7.5 V to 16.5 V Gamma current drive: 15 mA per channel Peak output current: 150 mA Output voltage stable under load conditions 48-lead, Pb-free LQFP package Figure 1. 48-Lead LQFP Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved. ADD8709 TABLE OF CONTENTS Electrical Characteristics ................................................................. 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 7 Application Notes ........................................................................... 10 Voltage Regulator ....................................................................... 10 Maximum Power Dissipation ................................................... 10 Operating Temperature Range ................................................. 10 Typical Applications Circuit.......................................................... 12 Outline Dimensions ....................................................................... 13 Ordering Guide........................................................................... 13 REVISION HISTORY 10/04--Data Sheet Changed from Rev. 0 to Rev. A Changes to Product Overview Section .......................................... 1 Changes to Figure 1.......................................................................... 1 Changes to Electrical Characteristics Section .............................. 3 Changes to Absolute Maximum Ratings Section......................... 4 Changes to Pin Configuration and Function Description.......... 5 Changes to Typical Performance Characteristics Section........... 7 Changes to Applications Notes Section ....................................... 10 Changes to Figure 28, Typical Applications Circuit................... 12 Changes to Ordering Guide .......................................................... 13 8/04--Revision 0: Initial Version Rev. A | Page 2 of 16 ADD8709 ELECTRICAL CHARACTERISTICS VDD = 16 V, TA @ 25C, unless otherwise noted. Table 1. Parameter BUFFER CHARACTERISTICS OUTPUTS Output Voltage Range (Ch18 to Ch10) Output Voltage Range (Ch9 to Ch1) Output vs. Load (Ch18, Ch17, Ch2, Ch1) Output vs. Load (Ch16 to Ch3) INPUTS Offset Voltage Offset Voltage Drift Input Bias Current Input Voltage Range (Ch18 to Ch10) Input Voltage Range (Ch9 to Ch1) DYNAMIC PERFORMANCE Slew Rate Bandwidth Settling Time to 0.1% Phase Margin Power Supply Rejection Ratio VOLTAGE REGULATOR Programmable Range Initial Regulator Accuracy Dropout Voltage Line Regulation Load Regulation Maximum Load Current Feedback Reference Voltage Feedback Input Bias Current POWER SUPPLY Supply Voltage Supply Current 1 Symbol Conditions Min VOUT VOUT VOUT1 VOUT IL = 100 A IL = 100 A IL = 20 mA IL = 5 mA 1.4 0 1 VOS VOS/T IB VIN VIN SR BW tS o PSRR VREG OUT VACC VDO REGLINE REGLOAD IO VREF IBFB VS ISY Typ 5 20 0.5 1.4 0 4 68 5 -40C TA +105C -150 Rev. A | Page 3 of 16 V V mV mV 15 mV V/C A V V 1.5 VDD VDD - 1.4 V/s MHz s Degrees dB 0.4 100 310 0.01 0.02 VDD - 0.6 1.5 150 350 0.20 0.10 1.2 10 150 V % mV mV %/V %/mA mA V nA 10.5 16.5 17 V mA 7.5 VOUT is the shift from the desired output voltage under the specified current load. VDD VDD - 1.4 6 4.5 1.1 55 90 5 No load; VREG OUT = 14.4 V IL = 100 A IL = 5 mA VIN = 8.5 V to 16.5 V, VOUT = 8 V IO = 100 A to 10 mA -40C TA +105C No load, -40C TA +105C Unit 15 5 -40C TA +105C -40C TA +105C RL = 10 k, CL = 200 pF -3 dB, RL = 10 k, CL = 200 pF 1 V step, RL = 10 k, CL = 200 pF RL = 10 k, CL = 200 pF VDD = 7 V to 17 V, -40C TA +105C Max ADD8709 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage (VDD) Input Voltage Storage Temperature Range Operating Temperature Range1 Junction Temperature Range Lead Temperature Range (Soldering, 60 sec) ESD Tolerance (HBM) ESD Tolerance (MM) Rating 18 V -0.5 V to VDD -65C to +150C -40C to +105C -65C to +150C 300C 2000 V 150 V Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3. Package Characteristics Package Type LQFP (ST) 1 JA 74.57 Unit C/W See Application Notes section. ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. A | Page 4 of 16 ADD8709 VOUT15 VOUT14 VOUT13 44 43 42 41 40 39 38 37 REGFB 1 36 VOUT10 GND 2 35 VOUT9 VDD 3 34 VOUT8 VREG OUT 4 33 VOUT7 VIN18 5 32 VDD VIN17 6 ADD8709 31 GND VIN16 7 TOP VIEW (Not to Scale) 30 VOUT6 VIN15 8 29 VOUT5 VIN14 15 16 17 18 19 20 21 22 23 24 VIN1 GND VDD VIN10 14 VIN2 VOUT1 13 VIN3 25 VIN4 VOUT2 VIN11 12 VIN5 26 VIN6 VOUT3 VIN12 11 VIN7 VOUT4 27 VIN9 28 VIN8 9 VIN13 10 04715-002 VOUT16 45 VOUT11 VOUT17 46 VOUT12 VOUT18 47 VDD GND 48 GND VDD PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 2. 48-Lead Low-Profile Quad Flat Package (ST-48) Table 4. Pin Function Descriptions Pin No. 1 Name REGFB 2 3 4 GND VDD REGOUT 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 VIN18 VIN17 VIN16 VIN15 VIN14 VIN13 VIN12 VIN11 VIN10 VIN9 VIN8 VIN7 VIN6 VIN5 VIN4 VIN3 VIN2 VIN1 GND VDD VOUT1 VOUT2 Description Regulator feedback. Compares a percentage of the regulator output to the internal 1.2 V voltage reference. Ground. Normally 0 V. Supply voltage. Normally 16 V. Regulator output voltage. Provides a regulated output voltage for use as a reference for the gamma resistors. Buffer inputs. An external resistor calculator is available upon request from your local sales office. Ground. Normally 0 V. Supply voltage. Normally 16 V. Buffer outputs. These buffers can swing to ground. Rev. A | Page 5 of 16 ADD8709 Pin No. 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Name VOUT3 VOUT4 VOUT5 VOUT6 GND VDD VOUT7 VOUT8 VOUT9 VOUT10 VOUT11 VOUT12 GND VDD VOUT13 VOUT14 VOUT15 VOUT16 VOUT17 VOUT18 GND VDD Description Buffer outputs. These buffers can swing to ground. Ground. Normally 0 V. Supply voltage. Normally 16 V. Buffer outputs. These buffers can swing to ground. Buffer outputs. These buffers can swing to VDD. Ground. Normally 0 V. Supply Voltage. Normally 16V. Buffer outputs. These buffers can swing to VDD. Ground. Normally 0 V. Supply voltage. Normally 16 V. Rev. A | Page 6 of 16 ADD8709 TYPICAL PERFORMANCE CHARACTERISTICS 20 ISINK = 25mA 15 25 ISINK = 15mA 0 ILOAD = 0mA -5 -10 -15 -20 ISOURCE = 25mA -30 -35 -20 -10 ISOURCE = 15mA ISOURCE = 5mA 0 10 20 30 40 50 60 70 TEMPERATURE (C) 80 CH3 SINK CH9 SINK 10 5 1 10 LOAD CURRENT (mA) 100 Figure 6. Output Voltage Error vs. Load Current (Channels 3 and 9) 30 25 OUTPUT VOLTAGE ERROR (mV) 25 CH17 SOURCE 20 CH18 SOURCE 15 10 CH18 SINK 5 04715-004 OUTPUT VOLTAGE ERROR (mV) CH9 SOURCE 15 0 0.1 90 100 110 120 Figure 3. Output Voltage Error vs. Temperature CH17 SINK 0 0.1 CH3 SOURCE 1 10 LOAD CURRENT (mA) 20 CH1 SOURCE 15 CH1 SINK Figure 4. Output Voltage Error vs. Load Current (Channels 17 and 18) CH2 SINK 10 5 0 0.1 100 CH2 SOURCE 04715-007 -25 20 04715-006 OUTPUT VOLTAGE ERROR (mV) 5 04715-003 OUTPUT VOLTAGE ERROR (mV) ISINK = 5mA 10 1 10 LOAD CURRENT (mA) 100 Figure 7. Output Voltage Error vs. Load Current (Channels 1 and 2) 30 1000 NUMBER OF AMPLIFIERS 800 20 15 10 CH10 SOURCE CH10 SINK 0 0.1 1 10 LOAD CURRENT (mA) 600 500 400 300 200 5 CH16 SINK 700 04715-009 CH16 SOURCE 04715-005 OUTPUT VOLTAGE ERROR (mV) 900 25 100 0 -0.30 100 Figure 5. Output Voltage Error vs. Load Current (Channels 10 and 16) -0.18 -0.10 -0.02 0.06 0.14 0.22 0.30 GAMMA OUTPUT ERROR DUE TO OFFSET (% OF FS) Figure 8. Gamma Output Voltage Error Rev. A | Page 7 of 16 ADD8709 8 7 6 5 4 3 04715-008 1 0 200 400 650 600 550 500 450 5mA 400 350 300 250 200 150 100 2 0 -200 10mA 700 DROPOUT VOLTAGE (mV) 9 AMPLITUDE (V) 800 750 10V PULSE 120pF 320pF 520pF 1nF 10nF 10 0mA 50 0 -25 -15 -5 600 800 1000 1200 1400 1600 1800 TIME (ns) 04715-013 11 Figure 9. Gamma Buffers Load Transient Response vs. Capacitive Loading 5 15 25 35 45 55 65 TEMPERATURE (C) 75 85 95 105 115 Figure 12. Dropout Voltage vs. Temperature 15 14.5 14 14.4 13 -20C 14.3 11 9 ILOAD = 0mA ILOAD = 5mA 8 7 6 5 ILOAD = 10mA 4 3 0C 14.2 +25C 14.1 +55C 14.0 +85C 13.9 +95C 13.8 +105C 04715-011 2 1 0 17 16 15 14 13 12 11 10 9 8 7 6 INPUT VOLTAGE (V) 5 4 3 2 1 04715-014 10 REGULATOR OUTPUT (V) OUTPUT VOLTAGE (V) 12 13.7 13.6 0 0 Figure 10. Dropout Characteristics 2 4 6 8 10 12 14 LOAD CURRENT (mA) 16 20 Figure 13. Regulator Output vs. ILOAD over Temperature 0 14.45 100 0mA 200 REGULATOR OUTPUT (V) 14.40 300 400 500 600 700 800 5mA 14.35 14.30 10mA 900 1000 14.20 -20 -10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 OUTPUT CURRENT (mA) 04715-015 14.25 04715-012 DROPOUT VOLTAGE (mV) 18 0 10 20 30 40 50 60 70 TEMPERATURE (C) 80 90 100 110 Figure 14. Regulator Output vs. Temperature Figure 11. Dropout Voltage vs. Output Current Rev. A | Page 8 of 16 ADD8709 18 12 CLOAD = 1F 0 16 -200 -400 14 8 7 6 5 4 3 2 04715-016 15 9 04715-018 200 10 SUPPLY CURRENT (mA) 400 OUTPUT VOLTAGE CHANGE (mV) INPUT VOLTAGE (V) 17 11 1 0 0 TIME (100s/DIV) 2 4 6 8 10 12 SUPPLY VOLTAGE (V) 14 16 18 Figure 17. Supply Current vs. Supply Voltage Figure 15. Regulator Line Transient Response 11.0 CLOAD = 1F -40 0.1 5 TIME (100s/DIV) 10.8 10.7 10.6 10.5 10.4 -20 Figure 16. Regulator Load Transient Response 04715-019 -20 SUPPLY CURRENT (mA) 0 10.9 04715-017 LOAD CURRENT (mA) 20 OUTPUT VOLTAGE CHANGE (mV) 40 0 20 40 60 TEMPERATURE (C) 80 Figure 18. Supply Current vs. Temperature Rev. A | Page 9 of 16 100 120 ADD8709 APPLICATION NOTES The ADD8709 is a gamma reference generator that allows source drivers to be optimized for the different combinations of liquid crystals, glass sizes, etc. in large LCD panels. In a typical panel application, the selected source drivers have an internal gamma curve that is not ideal for the specific panel, as shown in Figure 19. The ADD8709 allows the gamma curve in the source drivers to be adjusted appropriately, and also ensures that all of the source drivers have the same gamma curve. MAXIMUM POWER DISSIPATION The maximum safe power dissipation in the ADD8709 package is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150C, the glass transition temperature, the properties of the plastic change. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ADD8709. Exceeding a junction temperature of 175C for an extended period can result in changes in the silicon devices, potentially causing failure. 16 OPERATING TEMPERATURE RANGE 14 The junction temperature is GAMMA VOLTAGE (V) 12 TJ = TAMB + JA x PDIS 10 where: TAMB = ambient temperature. JA = junction-to-ambient thermal resistance, in C/watt. PDIS = power dissipated in the device, in watts. 8 ORIGINAL GAMMA CURVE IN SOURCE DRIVERS 6 PANEL GAMMA CURVE CORRECTED BY ADD8709 4 For the ADD8709, PDIS can be calculated by 04715-020 2 0 PDIS = VDD x IDQ + (IOUT X(+) x (VDD - VOUT X)) + (-IOUT X(-) x VOUTX) + (VDD - VREG OUT) x ILOAD where: GAMMA REFERENCE INPUT POINTS Figure 19. Original and Corrected Gamma Curves The ADD8709 also includes a low dropout linear regulator to provide a stable reference level for the gamma curve for best panel performance. VOLTAGE REGULATOR The on-board voltage regulator provides a regulated voltage to the external resistors to set different gamma voltages. The output of the regulator is set by the two resistors, R1 and R2, and an internal reference voltage of 1.2V. In the ADD8709, R1 and R2 are external components. The output voltage can is found by VDD x IDQ = nominal system power requirements. IOUT X(+) x (VDD - VOUT X) = positive-current amplifier load power dissipation (current comes from VDD). -IOU XT(-) x VOUT X = negative-current amplifier load power dissipation (current goes to GND). (VDD - VREG OUT) x ILOAD = regulator load power dissipation. Example 1 To calculate an estimated power consumption of the ADD8709 assume: VREG OUT = VREF x (R2/R1 + 1) R2 55k R1 5k + - 04715-021 VREG OUT VREF 1.2V Figure 20. Voltage Regulator Rev. A | Page 10 of 16 VDD x IDQ = 16 V x 15 mA = 0.240 W. (VDD - VREG OUT) x ILOAD = (16 V - 14.4 V) x 5 mA = 0.008 W. ADD8709 PDIS = 0.240 W + 0.731 W + 0.008 W =0.979 W Table 5. VOUT18 VOUT17 VOUT16 VOUT15 VOUT14 VOUT13 VOUT12 VOUT11 VOUT10 VOUT9 VOUT8 VOUT7 VOUT6 VOUT5 VOUT4 VOUT3 VOUT2 VOUT1 VOUT X (V) 14.400 11.405 10.627 10.397 10.195 10.080 9.821 9.130 8.611 6.480 6.077 5.098 4.810 4.694 4.435 4.205 3.398 0.202 IOUT X (mA) 4.3 5.2 -4.4 7.3 7.6 -3.9 8.3 7.9 -4.5 -4.2 5.6 -3.3 -6.9 5.7 3.5 9.6 -9.5 -7.2 (IOUT X(+) x (VDD - VOUT X)) + (-IOUT X(-) x VOUT X) P (W) 0.00688 0.0239 0.0468 0.0409 0.0441 0.0393 0.0513 0.0543 0.0389 0.0272 0.0556 0.0168 0.0332 0.0644 0.0405 0.113 0.0323 0.00145 JA = 74.57C/W, TAMB = 45C TJ = 45C + (74.57C/W) x (0.979 W) = 118.0C Here, 150C is the maximum junction temperature that is guaranteed before the part breaks down, while 125C is the maximum process limit. Because TJ is < 150C and < 125C, this example demonstrates a condition where the part should perform within process limits. 0.731 Rev. A | Page 11 of 16 ADD8709 TYPICAL APPLICATIONS CIRCUIT VDD 16V 0.1F FB 700* + 1.2V - 55k VREG OUT 0.1F 0 3.12k 810 240 210 120 270 720 540 EXTERNAL RESISTORS TO SET GAMMA VOLTAGES 2.22k 420 1.02k 300 120 270 240 840 3.33k VOLTAGE REGULATOR GAMMA BUFFERS 14.4V VIN18 700* VOUT18 14.400V VIN17 700* VOUT17 11.405V VIN16 700* VOUT16 10.627V VIN15 700* VOUT15 10.397V VIN14 700* VOUT14 10.195V VIN13 700* VOUT13 10.080V VIN12 700* VOUT12 9.821V VIN11 700* VOUT11 9.130V VIN10 700* VOUT10 8.611V VIN9 700* VOUT9 6.480V VIN8 700* VOUT8 6.077V VIN7 700* VOUT7 5.098V VIN6 700* VOUT6 4.810V VIN5 700* VOUT5 4.694V VIN4 700* VOUT4 4.435V VIN3 700* VOUT3 4.205V VIN2 700* VOUT2 3.398V VIN1 700* VOUT1 0.202V 210 *ESD PROTECTION RESISTORS GND GND Figure 21. Typical Applications Circuit Rev. A | Page 12 of 16 GAMMA 18 GAMMA 17 GAMMA 16 GAMMA 15 GAMMA 14 GAMMA 13 GAMMA 12 GAMMA 11 GAMMA 10 GAMMA 9 GAMMA 8 GAMMA 7 GAMMA 6 GAMMA 5 GAMMA 4 GAMMA 3 GAMMA 2 GAMMA 1 GAMMA 18 GAMMA 17 GAMMA 16 GAMMA 15 GAMMA 14 GAMMA 13 GAMMA 12 GAMMA 11 GAMMA 10 GAMMA 9 GAMMA 8 GAMMA 7 GAMMA 6 GAMMA 5 GAMMA 4 GAMMA 3 GAMMA 2 GAMMA 1 GAMMA 18 GAMMA 17 GAMMA 16 GAMMA 15 GAMMA 14 GAMMA 13 GAMMA 12 GAMMA 11 GAMMA 10 GAMMA 9 GAMMA 8 GAMMA 7 GAMMA 6 GAMMA 5 GAMMA 4 GAMMA 3 GAMMA 2 GAMMA 1 04715-022 5k ADD8709 OUTLINE DIMENSIONS 0.75 0.60 0.45 9.00 BSC SQ 1.60 MAX 37 48 36 1 PIN 1 0.15 0.05 7.00 BSC SQ TOP VIEW 1.45 1.40 1.35 SEATING PLANE 0.20 0.09 7 3.5 0 0.08 MAX COPLANARITY (PINS DOWN) 25 12 13 VIEW A 0.50 BSC LEAD PITCH VIEW A 24 0.27 0.22 0.17 ROTATED 90 CCW COMPLIANT TO JEDEC STANDARDS MS-026BBC Figure 22. 48-Lead Low Profile Quad Flat Package [LQFP] (ST-48) Dimensions shown in millimeters ORDERING GUIDE Model1 ADD8709ASTZ-REEL2, 3 ADD8709ASTZ-REEL72, 3 ADD8709WSTZ-REEL2 ADD8709WSTZ-REEL72 1 2 3 Temperature Range -40C to +100C -40C to +100C -40C to +105C -40C to +105C Package Description 48-Lead Low Profile Quad Flat Package 48-Lead Low Profile Quad Flat Package 48-Lead Low Profile Quad Flat Package 48-Lead Low Profile Quad Flat Package Available in reels only. Z = Pb-free part. WARNING: Not to be used in new design. Option for existing designs only. Rev. A | Page 13 of 16 Package Option ST-48 ST-48 ST-48 ST-48 ADD8709 NOTES Rev. A | Page 14 of 16 ADD8709 NOTES Rev. A | Page 15 of 16 ADD8709 NOTES (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04715-0-10/04(A) Rev. A | Page 16 of 16